A PKI consists of a ____________ hierarchy if there is a root CA that issues certificates to one or more subordinate CAs, whose job is to issue certificates to users and computers on your network

a. One-tier
b. Two-tier
c. Three-tier
d. Four-tier

B. Each subordinate CA can be dedicated to a single type of certificate, such as a smart card, Encrypting File System (EFS), and so on, or to a geographical location of a multisite network.